Update Dependencies

[abdultemizkan06-alt]

Hello,

-- rollup-plugin-postcss@4.0.2 -- cssnano@5.1.15
-- cssnano-preset-default@5.2.14 -- postcss-svgo@5.1.0
-- svgo@2.8.0 -- stable@0.1.8

can you please update cssnano as its using an outdated pckage stable..